Shearing machine

Abstract

A shearing machine for shearing a plate workpiece includes a frame; a ram having an upper cutting blade and being mounted on the frame in a vertically movable manner; a worktable being fixedly mounted on the frame and having a lower cutting blade to define an opening between the upper cutting blade and the lower cutting blade so that the plate workpiece to be sheared may be fed from the front side of the upper blades into the opening with a portion of the plate workpiece extending to the rear side of the opening; a conveyor being mounted on the frame for supporting the portion of the plate workpiece and for conveying the sheared portion of the plate workpiece to the rear side of the shearing machine, the conveyor being vertically movable in response to the vertical movement of the ram; and a drive shaft means having an eccentric member for driving both the ram and the conveyor reciprocably up and down so that the conveyor descends before, or simultaneously with, the actual cutting into the workpiece by the upper cutting blade. The machine includes a cost-saving adjustable restraint, and a shiftable sheared product stacking mechanism.

What is claimed is: 
     
       1. A shearing machine for shearing a plate workpiece comprising: a frame;   a ram having an upper cutting blade and being mounted on the frame in a vertically movable manner;   a worktable being fixedly mounted on the frame and having a lower cutting blade to define an opening between the upper cutting blade and the lower cutting blade so that a plate workpiece is placed so as to be sheared on the worktable;   an upper connecting plate being mounted on the frame adjacent to, and in parallel with, the ram;   a plate restraint means having a plurality of elastic bodies, which restraint means are supported by the upper connecting plate in a vertically movable manner and are urged resiliently to the lower direction for securing the workpiece on the worktable, said plate restraint means being in engageable contact with the ram so as to be raised by the upward movement of the ram, said plate restraint means including a plurality of elevating rods each having a flange member mounted on the respective upper ends thereof, said flange member cooperating with a fork member mounted on the upper section of the rain; and   a pressure adjusting means being mounted on the upper connecting plate and having a seat plate engageable with the elastic bodies to push the upper ends thereof by a hydraulic piston-and-cylinder, so that the resilient forces of the elastic bodies are adjustable.